idle for long periods of time with HVAC running for the dog, which is another diesel forte.
I got rid of a 17 Eco-D to get the 19 hemi 2 weeks go.
I had an 04.5 Duramax and you could idle that thing for weeks without a problem. These new diesels with their DPFs and DEF fluid do not like to be idled for long periods of time - it leads to massive soot buildup/contamination of the oil. If you are a 'screw the man and to heck with the warranty' kind of guy you can buy a $1000 tuner that works its way around a lot of the emission stuff or you can perform a full delete.
Loved the Eco-D on long hi way jaunts - got 23 to 24 at 78 to 82, but in town (ok - in the city), the mileage was no better than the hemi I traded in on the eco-D and the sluggish - let me rephrase that SLUGGISH throttle was a bit nerve-wracking in certain traffic situations.
Add in the cost of DEF, fuel filters every 20K and other increased maintenance costs including $125 oil changes ( 11.5 quarts of synthetic) and the economics didn't work for me.
I got $2000 less than I paid for my Eco-D after 2 years so it was time to move along.
To those who choose to pick up a 2020 1500 Eco-D I hope it works out how you want.